powerpc: Add AT_HWCAP2 to indicate V.CRYPTO category support

The Vector Crypto category instructions are supported by current POWER8
chips, advertise them to userspace using a specific bit to properly
differentiate with chips of the same architecture level that might not
have them.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org> [v3.10+]

2 files changed, 3 insertions, 1 deletions

diff --git a/arch/powerpc/include/uapi/asm/cputable.h b/arch/powerpc/include/uapi/asm/cputable.h
index 5b7657959faa..de2c0e4ee1aa 100644
--- a/arch/powerpc/include/uapi/asm/cputable.h
+++ b/arch/powerpc/include/uapi/asm/cputable.h
@@ -41,5 +41,6 @@
 #define PPC_FEATURE2_EBB                0x10000000
 #define PPC_FEATURE2_ISEL               0x08000000
 #define PPC_FEATURE2_TAR                0x04000000
+#define PPC_FEATURE2_VEC_CRYPTO         0x02000000
 
 #endif /* _UAPI__ASM_POWERPC_CPUTABLE_H */
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index c1faade6506d..11da04a4625a 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -109,7 +109,8 @@ extern void __restore_cpu_e6500(void);
                                  PPC_FEATURE_PSERIES_PERFMON_COMPAT)
 #define COMMON_USER2_POWER8     (PPC_FEATURE2_ARCH_2_07 | \
                                  PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_DSCR | \
-                                 PPC_FEATURE2_ISEL | PPC_FEATURE2_TAR)
+                                 PPC_FEATURE2_ISEL | PPC_FEATURE2_TAR | \
+                                 PPC_FEATURE2_VEC_CRYPTO)
 #define COMMON_USER_PA6T        (COMMON_USER_PPC64 | PPC_FEATURE_PA6T |\
                                  PPC_FEATURE_TRUE_LE | \
                                  PPC_FEATURE_HAS_ALTIVEC_COMP)